No Duplicates

manifest.json

{
  "background": {
    "scripts": [
      "popup.js"
    ]
  },
  "browser_action": {
    "default_icon": "logo.png",
    "default_popup": "options.html"
  },
  "content_security_policy": " default-src 'self' ; style-src https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css; script-src 'self' https://code.jquery.com/jquery-3.1.1.slim.min.js https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js",
  "description": "This extension will allow you to close duplicates of the same page",
  "icons": {
    "16": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "manifest_version": 2,
  "name": "No Duplicates",
  "options_page": "options.html",
  "permissions": [
    "activeTab",
    "tabs",
    "notifications",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "0.35"
}